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| Illustration 1 | g03685338 |
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Front right wheel station (1) Brake end plate (2) Wheel Spindle (3) Brake anchor (4) Purge valve | |
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| Illustration 2 | g03360253 |
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The front brakes (5) Wheel assembly (6) Brake discs (7) Chamber for the brake disc (8) Plates (9) Service piston cavity | |
Each front wheel contains a parking brake, and each of the front brakes contain seven brake discs.
Two disc type brakes are used for the service brake system on the tractor. There is one disc type brake on each front wheel. Oil from the brake circulation system bathes the discs that are located in chamber (7). A Duo-Cone seal (not shown) keeps this oil separate from axle oil. A second Duo-Cone seal keeps brake circulation oil inside the brake anchor (3) while keeping dirt, water, and other contaminants out. The brake circulation oil is also kept separate from the oil in the service piston cavity (9). The service piston compresses brake plates (8) and brake discs (6). Brake plates (8) are held stationary by splined teeth to the brake anchor (3). The brake anchor (3) is held stationary by splined teeth to the spindle (2). Brake discs (6) are splined onto wheel assembly (5). Compression between brake disks (6) and brake plates (8) creates torque to slow the rotation of the wheel assembly (5).
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| Illustration 3 | g03556345 |
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The location of these two details is typical. (10) display panel (14) Brake warning lamp | |
A loss of pressure in the service brake system will cause a warning message to appear on the display panel (10).
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| Illustration 4 | g03361236 |
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(11) Service brake pedal
(12) Brake control valve (13) One brake light switch and one switch that tells transmission Electronic Control Module (ECM) that the brakes are being applied. | |
The braking and the hydraulic fan pump sends oil to the control manifold. The control manifold contains valves that control the pressure in the brake accumulators. The control manifold contains two pressure sensors. The two pressure sensors send electronic signals to the monitoring system. When the brake accumulator pressure is low, the monitoring system turns on a brake warning lamp (14), refer to Illustration 4.
When you depress the service brake pedal (11), brake control valve (12) is actuated. Depressing brake control valve (12) will send pressurized oil from the brake accumulators to the service brakes. The position of the pedal regulates the amount of oil pressure to the brakes. Depressing the service brake pedal also activates two switches located in (13). One switch activates the brake lights, and the other switch tells the transmission ECM that the brakes are being applied.
Brake Control Manifold Sensors
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| Illustration 5 | g06217976 |
The service brake pressure sensor (15) reads the pressure in the brake accumulators and signals the brake charge solenoid when to charge the brake system.
The service brake pressure sensor (16) reads the pressure in the brake accumulators and signals the brake charge solenoid when to charge the brake system.
Service brake sensor (15) and service brake sensor (16) are redundant.
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| Illustration 6 | g03400166 |
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Purge valve | |
Purge valve (17) is used to purge air out of the brake system.
Reference: Refer to the Testing and Adjusting, "Brake System Air - Purge" for additional information concerning the Purge Valve.